SI5346B-B-GM

SI5346B-B-GM is Silicon Labs’ clock-management device from the Si534x family. It’s an integrated, programmable clock multiplier/zero-delay buffer that takes a single reference clock and generates multiple low-jitter output clocks with programmable frequencies and phases. Key ideas:
- Any-rate clock generation: fractional-N multiplication/division to produce multiple synchronized outputs with fixed relationships.
- Jitter cleaning and jitter transfer: designed to improve clock quality for high-speed digital interfaces.
- Multiple outputs: suitable for distributing clocks to CPUs, FPGAs, memories, SERDES, and other high-speed blocks.
- Programmable via I2C (register interface); configure with ClockBuilder Pro or the datasheet.
- Features such as phase alignment between outputs, support for spread-spectrum inputs, and robust lock behavior.
- Packaging: -GM denotes a RoHS-compliant, lead-free variant (Green) in Silicon Labs’ standard package.
Typical uses include PCIe, SATA/USB/HDMI, DDR memories, and other precision clocking needs in complex SoCs and boards. For exact specs, input range, and output options, consult the SI5346B datasheet and product page.

Key features of SI5346B-B-GM (concise):
- Jitter-attenuating, PLL-based clock generator with fractional-N synthesis
- Programmable multiple outputs with independently settable frequencies
- I2C/SMBus control for programming, monitoring, and dynamic reconfiguration
- Flexible input references: crystal/TCXO inputs (and optional secondary reference)
- Various output formats supported (LVCMOS/CMOS, LVDS, LVPECL, HCSL)
- Spread Spectrum Clocking to reduce EMI
- Enable/disable control and glitch-free output switching
- Power management: suitable multi-supply operation and low-power modes
- Small, robust package options; automotive-grade B-GM variant available
Note: exact output count, voltage ranges, and supported formats depend on the specific package/revision; consult the datasheet for precise specifications.

- Pin count: 32 pins (QFN-GM package)
- Function: I2C-programmable, jitter-attenuating clock generator/multiplier with multiple outputs (four outputs), i.e., a clock generator and distributor with zero-delay outputs derived from a reference clock.

- Manufacturer: Silicon Labs (Silicon Laboratories).
- What kind of company: A fabless semiconductor company that designs and markets timing ICs (like clock generators/jitter cleaners), wireless connectivity ICs, and microcontrollers for IoT and related applications.

SI5346B-B-GM is a multi-output, jitter-clean clock generator/distributor. Key application areas include:
- Telecom and data communications equipment for system clocks and jitter cleaning
- Networking gear (switches/routers) for SERDES reference clocks and clock distribution
- FPGA/ASIC platforms needing multiple synchronized reference clocks
- JESD204B/C ADC/DAC systems and other high-speed data converters
- PCIe, SATA, USB, HDMI clocking in consumer and enterprise devices
- Wireless RF transceivers requiring clean, low-jitter multi-output clocks
- General-purpose multi-output clock distribution with phase-aligned outputs

SI5346B-B-GM is packaged in a 16‑pin QFN package (4×4 mm) with an exposed pad (lead‑free).